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From 5b6fe3ecda7c000360065834e7eb14d1add8017d Mon Sep 17 00:00:00 2001
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From: Hari Bathini <hbathini@linux.vnet.ibm.com>
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Date: Thu, 8 Mar 2018 23:39:55 +0530
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Subject: [PATCH] makedumpfile: fix for hugepages filtering
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Kernel commit 036e7aa49fb2 changed 'compound_dtor' & 'compound_order'
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types from 'unsigned short' to 'unsigned char'. Fix it here to ensure
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hugepages are filtered properly.
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Also, makedumpfile tool commit 484c6b18624 used 'int' type for 'dtor'
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argument in 'isHugetlb' function. While this works in recent kernels
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that use 'unsigned short/char' type for 'compound_dtor', it breaks
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older kernels that used address of 'free_huge_page' as dtor. Fix it
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by changing 'dtor' type.
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Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
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Signed-off-by: Pingfan Liu <piliu@redhat.com>
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---
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makedumpfile.c | 30 ++++++++++++++++++++++++------
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makedumpfile.h | 1 +
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2 files changed, 25 insertions(+), 6 deletions(-)
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diff --git a/makedumpfile-1.6.2/makedumpfile.c b/makedumpfile-1.6.2/makedumpfile.c
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index ed138d3..ac8483d 100644
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--- a/makedumpfile-1.6.2/makedumpfile.c
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+++ b/makedumpfile-1.6.2/makedumpfile.c
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@@ -241,7 +241,7 @@ is_in_same_page(unsigned long vaddr1, unsigned long vaddr2)
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}
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static inline int
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-isHugetlb(int dtor)
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+isHugetlb(unsigned long dtor)
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{
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return ((NUMBER(HUGETLB_PAGE_DTOR) != NOT_FOUND_NUMBER)
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&& (NUMBER(HUGETLB_PAGE_DTOR) == dtor))
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@@ -5798,18 +5798,36 @@ __exclude_unnecessary_pages(unsigned long mem_map,
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* and PGMM_CACHED is a power of 2.
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*/
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if ((index_pg < PGMM_CACHED - 1) && isCompoundHead(flags)) {
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- if (order_offset)
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- compound_order = USHORT(pcache + SIZE(page) + order_offset);
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+ unsigned long long addr =
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+ (unsigned long long)(pcache + SIZE(page));
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+
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+ if (order_offset) {
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+ if (info->kernel_version >=
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+ KERNEL_VERSION(4, 16, 0)) {
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+ compound_order =
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+ UCHAR(addr + order_offset);
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+ } else {
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+ compound_order =
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+ USHORT(addr + order_offset);
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+ }
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+ }
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if (dtor_offset) {
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/*
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* compound_dtor has been changed from the address of descriptor
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* to the ID of it since linux-4.4.
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*/
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- if (info->kernel_version >= KERNEL_VERSION(4, 4, 0)) {
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- compound_dtor = USHORT(pcache + SIZE(page) + dtor_offset);
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+ if (info->kernel_version >=
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+ KERNEL_VERSION(4, 16, 0)) {
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+ compound_dtor =
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+ UCHAR(addr + dtor_offset);
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+ } else if (info->kernel_version >=
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+ KERNEL_VERSION(4, 4, 0)) {
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+ compound_dtor =
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+ USHORT(addr + dtor_offset);
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} else {
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- compound_dtor = ULONG(pcache + SIZE(page) + dtor_offset);
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+ compound_dtor =
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+ ULONG(addr + dtor_offset);
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}
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}
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diff --git a/makedumpfile-1.6.2/makedumpfile.h b/makedumpfile-1.6.2/makedumpfile.h
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index 01eece2..4cfad98 100644
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--- a/makedumpfile-1.6.2/makedumpfile.h
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+++ b/makedumpfile-1.6.2/makedumpfile.h
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@@ -241,6 +241,7 @@ static inline int string_exists(char *s) { return (s ? TRUE : FALSE); }
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string_exists((char *)(B)) && \
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(strncmp((char *)(A), (char *)(B), strlen((char *)(B))) == 0))
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+#define UCHAR(ADDR) *((unsigned char *)(ADDR))
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#define USHORT(ADDR) *((unsigned short *)(ADDR))
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#define UINT(ADDR) *((unsigned int *)(ADDR))
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#define ULONG(ADDR) *((unsigned long *)(ADDR))
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--
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2.7.4
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